Enterprise JavaBeans
by Richard Monson-Haefel


Following are the changes made in the 12/99 reprint:


(8) In about the middle of the page, changed:

        "In a read application, we would..."

To:

        "In a real application, we would "


(28) Toward the bottom of the page, changed:

        "notify the bean class that it is about activated "
to:

        "notify the bean instance that it is about to be activated "


{59}  The example read:


        public HypotheticalBean extends EntityBean {
            public int x;
            public double foo() {
                int i = this.getX( );
                return this.bar( );
            }
            public int getX(){
                return x;
            }
            private double boo(int i){
                double value = x * x;
                return x;
            }
        }

It now reads:

public HypotheticalBean extends EntityBean {
    public int x;

    public double foo() {
        int i = this.getX();
        return this.boo(i);
    }
    public int getX(){
        return x;
    }
    private double boo(int i){
        double value = i * Math.PI;
        return value;
    }
}


{73} In the lowest boxin the figure, the method name now reads:

	"setDeckLevel()"

instead of:

	"setName()".


{84} The first line of second paragraph started with:

        The CabinBean class extends javax.ejb.EntityBean

It now reads:

        The CabinBean class implements javax.ejb.EntityBean


{104} The code line:

        sd.setSessionTimeout(60);

Now reads:

        sd.setSessionTimeout(300);


(114) The last line of code that read:

	java.rmi.NoSuchObjectException: Bean has been deleted

was deleted.


{119} The code line:

        TravelAgent agent = home.fin;

Now reads:

        TravelAgent agent = home.create( );


{151} The following code block:

if(result.next()){
            name = result.getString("name");
            capacity = result.getInt("capacity");
            tonnage = result.getDouble("tonnage");
}else{
            throw new ObjectNotFoundException(
                "Cannot find Ship with id = "+id);
}

Now reads (the new line is: this.id = id;):

if(result.next()){
            this.id = id;
            name = result.getString("name");
            capacity = result.getInt("capacity");
            tonnage = result.getDouble("tonnage");
}else{
            throw new ObjectNotFoundException(
                "Cannot find Ship with id = "+id);
}


(170) Title read:

        Transitioning to the Ready state from the Pooled state
        via passivation

now reads:

        Transitioning from the Ready state to the Pooled state
        via passivation


(170) Title read:

        Transitioning to the Ready state from the Pooled state
        via removal

It now reads:

        Transitioning from the Ready state to the Pooled state


{179} The third line of code read:

        "import com.titan.travelagent.CreditCard;

It has been deleted.


(185) The following line of code was deleted:

	Statement stmt = null;


{185} code fragment // concatenation of strings was required because of
margin size in book.

           ps = con.prepareStatement
                ("INSERT INTO payment (customer_id, amount, type,"+
                  check_bar_code,check_number,credit_number,
                  credit_exp_date)"+ VALUES (?,?,?,?,?,?,?)");

now reads (string concatenate fixed):

           ps = con.prepareStatement
                ("INSERT INTO payment (customer_id, amount, type,"+
                  "check_bar_code,check_number,credit_number,"+
                  "credit_exp_date) VALUES (?,?,?,?,?,?,?)");

{194 & 195} Replaced:

package com.titan.travelagent;
import java.rmi.RemoteException;
import javax.ejb.FinderException;
import com.titan.cruise.Cruise;
import com.titan.customer.Customer;

public interface TravelAgent extends javax.ejb.EJBObject {
    public void setCruiseID(int cruise) throws RemoteException;
    public int getCruiseID() throws RemoteException;
    public void setCabinID(int cabin) throws RemoteException;
    public int getCabinID() throws RemoteException;
    public Ticket bookPassage(CreditCard card, double price)
      throws RemoteException,IncompleteConversationalState,
                DoubleBookingException;
}
------
with:
--------
package com.titan.travelagent;

import java.rmi.RemoteException;
import javax.ejb.FinderException;
import com.titan.cruise.Cruise;
import com.titan.customer.Customer;
import com.titan.processpayment.CreditCard;


public interface TravelAgent extends javax.ejb.EJBObject {

    public void setCruiseID(int cruise) throws RemoteException,
FinderException;
    public int getCruiseID() throws RemoteException;

    public void setCabinID(int cabin) throws RemoteException,
FinderException;
    public int getCabinID() throws RemoteException;

    public int getCustomerID( ) throws RemoteException;

    public Ticket bookPassage(CreditCard card, double price)
        throws RemoteException,IncompleteConversationalState,
               DoubleBookingException;

}


(198) Changed:

	"double.valueOf("
to:

	"Double.valueOf("


{199} The source code read:

   "public int getCustomerID( )throws RemoteException{
  if(cruise == null)
            throw new RemoteException();
        return ((CustomerPK)customer.getPrimaryKey()).id;
    }"

It now reads:

   "public int getCustomerID( )throws RemoteException{
        if(customer == null)
            throw new RemoteException();
        return ((CustomerPK)customer.getPrimaryKey()).id;
    }"


(209) Near the bottom of the page, changed:

	"data, we wou212

	ld use the Reservation bean."

to:

	"data, we would use the Reservation bean."

(209) Replaced:

public interface TravelAgent extends javax.ejb.EJBObject {

    public void setCruiseID(int cruise) throws RemoteException;
    public int getCruiseID() throws RemoteException;

---
with
---
public interface TravelAgent extends javax.ejb.EJBObject {

   public void setCruiseID(int cruise) throws RemoteException,
FinderException;
   public int getCruiseID() throws RemoteException;


---
(210) Replaced:

    public void setCabinID(int cabin) throws RemoteException;
    public int getCabinID() throws RemoteException;

    public Ticket bookPassage(CreditCard card, double price)
        throws RemoteException,IncompleteConversationalState,
               DoubleBookingException;

    public String [] listAvailableCabins(int bedCount)
        throws RemoteException, IncompleteConversationalState;
}
---
with
---
    public void setCabinID(int cabin) throws RemoteException,
FinderException;
    public int getCabinID() throws RemoteException;
    public int getCustomerID( ) throws RemoteException;
    public Ticket bookPassage(CreditCard card, double price)
        throws RemoteException,IncompleteConversationalState,
                   DoubleBookingException;

    public String [] listAvailableCabins(int bedCount)
        throws RemoteException, IncompleteConversationalState;
}

{273} In the first paragraph,

        "When the ShipBean is persisted ..."

now reads:

        "When the CabinBean is persisted ..."


(280) In the footnote, changed:

	"Version 2.0 of EJB."
to:

	"Version 1.1 of EJB."


{312} line 7 was missing parenthesis. It read:

	"new AccountKey(targetID);"

It now reads:

	"new AccountKey(targetID));